<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin:0;
      padding:0;
    }
    html,body{
      width:100%;
      height:100%;
    }
    .container{
      width:100%;
      height:100%;
      background:url(./bg.png) no-repeat;
      background-size:cover;
    }
    .box{
      position:fixed;
      width:1920px;
      height:1080px;
      background:red;
      transform-origin:left top;
      left:50%;
      top:50%;
    }
    .top{
      width:100px;
      height:100px;
      background:hotpink;
      margin-left:50px;
      
    }
    .bottom{
      width:100px;
      height:100px;
      background:skyblue;
      margin-left:50px;
      margin-top:100px;
    }
  </style>
</head>
<body>
  <div class="container">
    <!-- 数据组展示的区域 -->
     <div class="box">
      <div class="top">web前端工程师</div>
      <div class="bottom">UI设计师</div>
     </div>
  </div>
</body>
</html>
<script>
  // 控制数据大屏的放大与缩小
  let box = document.querySelector('.box')
  box.style.transform = `scale(${getScale()}) translate(-50%,-50%)`
  // 计算缩放比例
  function getScale(w=1920,h=1080){
    const ww = window.innerWidth/w
    const wh = window.innerHeight/h
    return ww<wh?ww:wh

    // ww<wh情况：1920/1920(ww) 1080/1080(wh)
    // ww>wh情况：
  }
  window.onresize=()=>{
    box.style.transform = `scale(${getScale()}) translate(-50%,-50%)`
  }
</script>